Add invocation counter

Author: oweise

src/main/java/hello/GreetingController.java

@@ -15,13 +15,16 @@ public class GreetingController {
     @Value("${background-color:white}")
     private String backgroundColor;
 
+    private int invocationCount = 0;
+
     @GetMapping("/")
     public String greeting(Model model) {
         model.addAttribute("name", System.getenv().getOrDefault("GREETING_DEFAULT", "World!"));
         model.addAttribute("hostname", System.getenv().getOrDefault("HOSTNAME", "unknown"));
         model.addAttribute("backgroundColor", backgroundColor);
         model.addAttribute("userDir", System.getProperty("user.dir"));
         model.addAttribute("password", System.getenv().getOrDefault("PASSWORD", "unknown"));
+        model.addAttribute("invocationCount", ++invocationCount);
         return "greeting";
     }
 

src/main/resources/templates/greeting.html

@@ -9,5 +9,6 @@
     <p th:text="'Hello, ' + ${name} + ' , this is host ' + ${hostname} + '!'"/>
     <p th:text="'My working directory is: ' + ${userDir}"/>
     <p th:text="'The password is: ' + ${password}"/>
+    <p th:text="'This page has been invoked ' + ${invocationCount} + ' times since application start.'"/>
 </body>
 </html>